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arm64: Honor limits set by bootloader

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Introduce a variable to save bootloader enforced memory limits and
restricts adding beyond this boundary during a memory hotplug. Also,
export this symbol so that other kernel module have access to it.

Change-Id: I28c100644b7287ec4625c4c018b5fffc865e2e72
Signed-off-by: Arun KS <arunks@codeaurora.org>
[sudaraja@codeaurora.org: check limit with physical address of page]
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
[swatsrid@codeaurora.org: Fix merge conflicts]
Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org>
[isaacm@codeaurora.org: Fix merge conflicts/use generic page onlining]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Arun KS 2017-09-15 13:52:00 +05:30 • committed by Isaac J. Manjarres
commit 46d635e8bd
2 changed files with 10 additions and 0 deletions
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3
arch/arm64/include/asm/memory.h
View file

@ -189,6 +189,9 @@ extern u64 kimage_vaddr;
/* the offset between the kernel virtual and physical mappings */
extern u64 kimage_voffset;
/* physical memory limit imposed by the booloader */
extern phys_addr_t bootloader_memory_limit;
static inline unsigned long kaslr_offset(void)
{
return kimage_vaddr - KIMAGE_VADDR;

7
arch/arm64/mm/init.c
View file

@ -257,6 +257,7 @@ int pfn_valid(unsigned long pfn)
EXPORT_SYMBOL(pfn_valid);
static phys_addr_t memory_limit = PHYS_ADDR_MAX;
phys_addr_t bootloader_memory_limit;
/*
* Limit the memory size that was specified via FDT.
@ -349,6 +350,12 @@ void __init arm64_memblock_init(void)
memblock_remove(0, memstart_addr);
}
/*
* Save bootloader imposed memory limit before we overwirte
* memblock.
*/
bootloader_memory_limit = memblock_end_of_DRAM();
/*
* Apply the memory limit if it was set. Since the kernel may be loaded
* high up in memory, add back the kernel region that must be accessible